开鲁坳陷宝龙山地区铀矿化特征及控矿因素分析

Analysis of Uranium Metallogenic Characteristics and Ore-controlling Factors of the Baolongshan Area,Kailu Sub-basin

开鲁坳陷作为松辽大型内陆盆地的一部分,近年来的铀矿勘查取得了重要突破。本文通过对开鲁坳陷的区域地质背景分析,尤其是开鲁坳陷钱家店凹陷中的宝龙山地区铀成矿条件及铀矿化特征的分析,总结出研究区内铀矿化的主要控矿因素为五个方面:断裂构造控制、沉积相与砂体控制、后生还原蚀变作用、后生氧化作用、热流体改造作用。通过成矿控制因素分析研究得出,开鲁坳陷宝龙山地区断裂构造与氧化—还原过渡带重叠部位是该区铀矿找矿重要区域。

Through analyzing uranium metallogenic conditions and mineralization characteristics of the Baolongshan area in the Kailu sub-basin, the five major ore-controlling factors are summarized in the study area, i. e. , fault, sedimentary facies and sandbody, epigenic reduction, epigenic oxidation and hydrothermal reworking. It is proposed that the joint part of basin-controlling fault of faulted basin and transition zone is the important region for uranium mineralization.